What is the speed of the fan motor in most electric furnaces?

The most common RPM is 1200 (1050 or 1075) also 900 (850, 825) and 1550 are used too. Most motors are single speed but can have as many as 4 speeds (3 is typical for direct drive indoor blowers on most furnaces).

Do furnace fans have different speeds?

When you have a gas furnace with straight cooling, there is a high likelihood that you’ll use two different fan speeds for cooling and heating. If the system you’re setting up is a heat pump, you’ll use the same fan speed for cooling and heating mode operation. … This includes the condition of the fan, filter, and coil.

How many speeds does a blower motor have?

The blower fan motor in most air conditioners has three speed settings – low, medium and high. In the factory, the fan is unsually set at medium speed, but another speed may be selected during installation. User selection of fan speeds on a day-to-day basis is not available.

Can you speed up furnace fan?

Once you cut the power, you can remove the cover of your furnace to get access to the control board. Adjusting the pulley on the blower driver motor lets you increase or decrease the blower speed. … Turn the pulley one rotation clockwise on the shaft. If you want even more speed, do two rotations.

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Are Single stage furnaces more reliable?

Most 90%-plus single-stage furnaces are 90% to 95% efficient. A few are higher. The Carrier Performance Boost 90 furnace offers an outstanding 96.5% AFUE. A two-stage furnace runs at 70% capacity most of the time it is heating.

Is variable speed motor in furnace worth the cost?

The best news … a variable speed furnace motor is 80–85% more efficient than a standard furnace motor. … If you don’t have a 90% efficiency or higher furnace in your home, then yes it may well be worth the cost to upgrade.

How do you know if your blower motor is bad?

What Are Signs Your Blower Motor Needs to Be Replaced?

  1. Poor or Airflow from Air Vents. This will be the first and most obvious sign your blower motor has a problem. …
  2. No Airflow At All From Vents. …
  3. Skyrocketing Energy Bills. …
  4. Strange Noises When You Turn on the Heat. …
  5. Overheating Blower / Weird Smells.

How much does a blower motor cost?

Replacing a blower motor costs $450 on average with a typical range of $250 to $800. With a warranty, you might pay as little as $150 for labor alone. For high-end models, like those with large motors or access issues, you might pay as much as $2,000.

Can you slow down a fan motor?

With a Shaded Pole motor, you can simply reduce the voltage, say with a light dimmer and the motor produces less torque, then with less torque the air friction on the fan blades causes it to slow down, which in turn moves less air.

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How does fan speed affect humidity?

There is a price to pay for humidity control. When we lower the blower speed to remove more moisture, we also lower the system efficiency. If the blower remains at the lower speed, then the efficiency is lowered under all conditions, even when humidity removal is not needed. This brings us to humidity controls.

How do I increase the airflow in a room?

5 Ways to Improve Airflow in Your Home

  1. Check Vents and Registers. One of the simplest things you can do to increase airflow in your home is to check the vents and registers in each room. …
  2. Turn on Ceiling Fans. …
  3. Schedule HVAC Maintenance. …
  4. Consider Duct Cleaning. …
  5. Invest in a Ventilator.

How many CFM is a furnace fan?

Furnace Blower Options



In essence, the unit is either operating at full capacity when the thermostat calls for heating, or it is turned off when the demand is met. Single speed blowers are factory calibrated to operate between 1200-1800 CFM, which will generally meet the requirements of a 1000-2000 square foot home.

Can I put a bigger blower motor in my furnace?

Yes, you can change your blower motor’s speed to try and improve your airflow if your blower motor is not already at the highest speed. On most blower motors the black wire is the high-speed wire.

What fan speed is best for heating?

Optimizing Fan Speed Summary



For your furnace and AC to work properly, and keep humidity in check, your system first needs to be sized correctly. Second, it needs to be installed correctly, and fan speeds need to be set to deliver CFMs between 350 and 400 CFM/ton of cooling.

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